Hello, i had a Samsung Galaxy S2 and everything was working fine with Airdroid, sending files from computer to mobile and sending files from mobile to computer. I have now a Galaxy S4 and sending files from mobile to computer stills works correctly, but i canÂ´t send files from computer to mobile. I get next warning (spanish): Tarjeta sd sin permisos de escritura (not allowed to write on sd card). How can i fix this problem? ItÂ´s a 32gb samsung card, with no protection slot. Thanks